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The letter states: "While these proposals are a step in the right direction it is clear we must do more to protect the further 15 million households who continue to be preyed on by the big six energy firms.

"It was promised in the three leading party manifestos. We hope you will work with us and Ofgem to stop this Big-6 stitch-up, and pledge to help the millions of households who Ofgem seem set to ignore."